CN1024247C - Driving method for 3-D high luminance LCD projector - Google Patents

Abstract

The present invention uses two separated optical systems to separately project left and right view images on a display screen through light sources. One left view image and the right view image which is just displayed and recorded are beamed; vice versa, a three-dimensional image is completed, and the image brightness in a display is upgraded.

Description

Driving method for 3-D high luminance LCD projector

The present invention relates to three-dimensional television (3-D TV) system of a kind of liquid crystal display (LCD) projector, specifically, what relate to is the driving method of a kind of high brightness three-dimensional (3-D) projector.This projector is generally perceiveed the dark space by polariscope, watches clear bright 3-D image simultaneously for some spectators.

As everyone knows, shown in Figure 3 only in the direction vibration of advancing perpendicular to it.In general, be referred to as the plane of polarization on the plane that the direction of advance and the direction of vibration of light are done.Among Fig. 3, have a plane of polarization that on the YZ plane, constantly changes at the light that advances on the directions X, and be not polarization on single direction, as the situation shown on the initial point.

Here, the light that the component on the plane of polarization is had a directional characteristic is referred to as polarised light.Particularly when the plane of polarization was limited in a plane, this light was referred to as straight line (beeline) polarised light.Polarization plates (or polarizing filter) A, B are used for making not polarization on a direction of a part of light of passing through, thereby only export the light of polarization on a certain direction corresponding with this part.

As shown in Figure 4, the driving of liquid crystal is carried out with the straight line polarization plates.Linear polarization is the light of the polarization plates A before the liquid panel by being positioned at light source S one side only.Linearly polarized photon is input on the liquid crystal cell, and drives the structure cell of liquid crystal cell by pictorial information independently.Light by this liquid crystal cell C is adjusted by the polarization plates B that is positioned at rear side.Load onto the polarization plates B that this is positioned at rear side, it is with respect to have an appointment 90 ° polarization direction of the polarization plates A that is positioned at the front side.Because liquid crystal cell is rotated 90 ° when adding voltage, makes light by being positioned at the polarization plates of rear side.

On the other hand, when not adding voltage, liquid crystal cell does not rotate, and the light by liquid crystal cell is interdicted at the polarization plates B place that is positioned at rear side.

The image of watching with left eye and during with the picture overlapping of right eye will be felt stereoeffect.

According to Fig. 5, polarization plates 13 comprises three optical elements 13,11,9, the image that their representatives are watched by left eye.On the other hand, polarization plates 14 comprises three optical elements 14,12,10, the image that their representatives are watched by right eye.

Therefore, it is anti-13,14 to load onto polarization, their linear polarization direction is intersected, so that obtain stereoeffect.

Much less, the polarization plates 9,10th of Fig. 5 is installed by above-mentioned direction, in order to drive the liquid crystal cell relevant with polarization plates 13,14.

Therefore, the polarised light of representing left and right sides pictorial information respectively and having a light characteristic that intersects each other is simultaneously displayed on the screen.

With regard to polarising glass D, the left avertence glasses that shake have a linear polarization structure, and its formation has and the polarization direction of the corresponding image of left eye, so can receive the image that left eye is watched.

On the other hand, the right eye mirror is designed to have linearly polarized photon, and its composition has the polarization direction with the corresponding image of right eye.

Therefore, because the characteristic of linearly polarized photon, the image that left eye is watched is presented on the left eye, and the image that right eye is watched is presented on the right eye.

Optical element 17,19,15,13,11,9,7,6 is finished following function, to show and the corresponding image of left eye.Speculum 19 is reflected in the light that rear side advances, and to increase the efficient of light, optical element 13,11,9 is realized a pictorial information, and projecting lens 7 throws pixels and they are amplified, and forms image on screen 6.

In conventional art, 3-D TV system comprises that as shown in Figure 1 a cathode ray tube (CRT), one have the signal source of 3-D image, shutter controller and left and right sides liquid crystal (LC) window.The method that this system adopts is that TV is clapped a left side and right side scene respectively, so that by corresponding eyes, watches the left and right sides scene respectively to the mode of scene separately soon with every.

When the picture intelligence of the scene that a left side gamma camera is absorbed was presented on the CRT, the controller of received signal source signal only allowed left eye watch left side scene image right side LC close, otherwise, only allow right eye watch right side scene image.

Yet, in traditional 3-D TV, the light beam on the brightness of image depends on from the light source projects to CRT makes when watching the dark space of 3-D image, generally need to use polariscope, thereby spectators are only limited to the people who has worn the shading mirror that is connected to TV or synchronouss working with TV.

The objective of the invention is to provide the driving method of a kind of high brightness tripleplane device, make spectators watch light simultaneously, and add the brightness of high light from light source.

Fig. 1 shows the structure of traditional 3-D TV system.

Fig. 2 shows the structure of 3-D LCD projector of the present invention.

Fig. 3-4 is the General Principle figure of explanation polarised light.

Fig. 5 illustrates that prior art left and right sides image projects on the screen and the graphic explanation of projection control procedure.

Numbered critical piece is as follows among Fig. 2: 17 and 18 is light source, and 25 is a charge-coupled device (CCD), and 24 and 27 is that digital-to-analog (D/A) changes device, 33 expression left side scene PSs, and 34 is right side scape PS. Refer now to accompanying drawing and be described in detail the present invention.

A most preferred embodiment according to the present invention comprises: the left and right sides optical system, in order to beam flying to a screen 6; Left side optical system 33 comprises left side lens 7, S polariscope 9, left side LCD plate 11, polariscope 13, collector lens 15, a light source 17 and a minute surface 19; Right side optical system 34 comprises right side lens 8, a P polariscope 10, right side LCD plate 12, polariscope 14, collector lens 16, a light source 18 and a minute surface 20.

With regard to the left and right sides optical system, the output of signal 2 is connected with demultplexer 30 via analog to digital (A/D) transducer 31, one of them output of the latter is connected with left side optical system 33 through CCD25, numeral, analog converter 24 and LCD driver circuit 23, and another output then is connected with right side optical system 34 with LCD drive circuit 26 through CCD28, digital-to-analog (D/A) transducer 27.Another output of signal source 2 is connected to left and right sides signal identifier 32, the output of this identifier 32 is connected to the RE(READ ENABLE of demultplexer 30, CCD28, read to enable) the WE(WRITE ENABLE of end and the CCD25 of left side PS 33 usefulness, write and enable) end, and the RE that also is connected to the CCD25 of the WE end of CCD28 and left side PS 33 usefulness via not gate 29 holds.

The left and right sides image that on LCD plate 11 and 12, forms by S polariscope 9 and polariscope 13 or P polariscope 10 and 14 and respectively polarization be S serial or the parallel image of P, and with the 3-D image on the synthetic screen 6 of the state group of S polarization or P polarization.Watch this image that is combined by polariscope 21,21, allow and respectively watch the corresponding scene in the left and right sides that arrives scenery, and set up 3-D effect as binocular vision.

Yet 2 eyes to spectators of signal source are respectively given the left and right sides image of visual field, make spectators feel that the image of being given is gloomy.So, arrange right image (it is the image of just being given before present left image) to occur together with the left image that shows usefulness in order to highlight.

In order to eliminate scintillation, also be provided with digital-to-analog (D/A) transducer 24,27; CCD25,28; Not gate 29; Demultplexer 30; Analog to digital (A/D) transducer 31; Left and right sides signal recognizing machine 32.

Operation of the present invention will be described in detail with reference to the accompanying drawings.

Along with providing a left side scene image each time, signal recognizing machine 32 is just read the picture intelligence as this left side scene, and output control signal " 1 ", and it finishes following operation.

At first, this signal provides an output " 1 " to the address of demultplexer 30, and the picture intelligence that demultplexer 30 was changed A/D then gives D/A converter 24.Secondly, be connected to the SPS(serial-to-parallel-serial of D/A converter 24 holding wires) CCD25 of structure started WE(WRTE ENANLE) with record left side video.The 3rd, the SPS CCD28 that is connected to right side D/A converter 27 holding wires has started RE(READ ENABLE) the right side image stored when providing earlier.

Subsequently, left side scene PS 33 just provides present left side image on screen, and right side PS 34 provides the right part of flg picture signals that had before just shown simultaneously.The operation of these left and right sides hockets, and makes the left and right sides PS always show the image of left and right sides together, with whole 3-D image with two light sources 17 and 18 gross powers with improve its brightness.

On the other hand, the D/A converter in the PS 24,27 returns the digitized picture conversion of signals to analog signal that the LCD drive circuit uses to drive LCD separately.

As mentioned above, the light source of the present invention by separately shown the left and right sides scene image of beam respectively to the screen.The mode that adopts be with a left side scene image with the right side scene image beam that before just has been shown and has write down, vice versa, makes the spectators of some band polariscopes can watch the picture of 3-D image.These two light sources also provide bright picture to spectators.

Claims (2)

1, in the three-dimensional image system that adopts two LCD projectors, a kind of driving method that supplies high brightness tripleplane device to use, it is characterized in that, by two light sources (17 separately, 18), the left side PS provides the present picture intelligence of left side scene on screen, and the right side PS provides the previous right side scene image that has just shown on screen, so that improve the brightness of the three-dimensional image on the screen.

2, method as claimed in claim 1 is characterized in that, the picture intelligence of the charge coupled device of serial-to-parallel-serial (25,28) record one visual field provides the output of another visual field picture intelligence that precedence record crosses simultaneously.

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